gso and gro with uring on send/receive for udp

udp/msghdr_helper_linux_32.go

@@ -0,0 +1,25 @@
+//go:build linux && (386 || amd64p32 || arm || mips || mipsle) && !android && !e2e_testing
+// +build linux
+// +build 386 amd64p32 arm mips mipsle
+// +build !android
+// +build !e2e_testing
+
+package udp
+
+import "golang.org/x/sys/unix"
+
+func controllen(n int) uint32 {
+	return uint32(n)
+}
+
+func setCmsgLen(h *unix.Cmsghdr, n int) {
+	h.Len = uint32(unix.CmsgLen(n))
+}
+
+func setIovecLen(v *unix.Iovec, n int) {
+	v.Len = uint32(n)
+}
+
+func setMsghdrIovlen(m *unix.Msghdr, n int) {
+	m.Iovlen = uint32(n)
+}